Figure 3.

Example of structure-based search. Two search features are provided. The structure search looks up for a peptide having exactly the query structure. The structural pattern search looks up for the peptides containing the query pattern as a subgraph. The query pattern can contain joker or alternatively-labeled nodes (X and/). In both types of search, the query can be specified using either linear or graph representation. A link to the dedicated peptide structure editor (in green) allows the user to automatically obtain the graph representation. Alternatively, the user can specify the query through the linear representation. In the last row, examples of resulting peptides are given.